1.- You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 34%. You would like to be 95% confident that your estimate is within 3% of the true population proportion. How large of a sample size is required?

n=_________

2.- You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately=70.7. You would like to be 98% confident that your estimate is within 3 of the true population mean. How large of a sample size is required?

n=_________

3.- You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately=40.1 dollars. You would like to be 95% confident that your estimate is within 2 dollar(s) of average spending on the birthday parties. How many parents do you have to sample?

n=___________

4.- A political candidate has asked you to conduct a poll to determine what percentage of people support him. If the candidate only wants a 2% margin of error at a 95% confidence level, what size of sample is needed? When finding the z-value, round it to four decimal places.

_____________